Use a spoon to remove the discolored pulp from the peach halves and discard.
Arrange the peaches, cut-side up, in the baking pan. Bake for about 20 minutes,
or until they are tender but still hold their shape.

Meanwhile, stir together the remaining ingredients, except the garnish, in a
small bowl.

To serve, place the peach halves, cut-side up in small dessert bowls. Top each
with about 2 tablespoons of the topping and sprinkle with cocoa powder stirred
through a fine mesh strainer.

Advance preparation:
The topping will keep in a covered container in the refrigerator for up to 2
days. Bake the fruit, cover, and refrigerate the day of serving. Assemble the
dessert just before serving.